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| Home > Publications database > Ab initio Calculations of Spin-Wave Excitation Spectra from Time-Dependent Density-Functional Theory |
| Home > Publications database > Ab initio Calculations of Spin-Wave Excitation Spectra from Time-Dependent Density-Functional Theory |
| Dissertation / PhD Thesis/Book | PreJuSER-15621 |
2012
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
ISBN: 978-3-89336-786-3
Please use a persistent id in citations: http://hdl.handle.net/2128/16523
Abstract: Magnetism is an intriguing phenomenon. It has fascinated people already in ancient times, when performers demonstrated the invisible magnetostatic forces which enable amber to attract lint and dust in an – at that time – incomprehensible and miraculous way. Since then, the exploration of magnetic effects has long been extended beyond pure curiosity. Nowadays a lot of the fundamental magnetic mechanisms are well understood, leading to a manifold of applications that are part of our every-day life in one way or another, ranging from effects on a macroscopic scale, such as the compass or the generator, to omnipresent applications of modern micro- and nanoelectronics most notably in the area of computing and information technology. The delightful journey into the magnetic realm has just begun, and – sufficient fundamental knowledge provided – stimulating developments are ahead of us! $\textbf{Applications of magnetism}$ The most prominent utilization on a microscopic scale is probably magnetic data storage – including computer hard disk drives – which is present in all aspects of information technology, ranging from IT infrastructure to consumer devices. The astonishing growth in electronics capabilities (e.g., computing power or storage capacity), which is commonly dubbed synonymously with Moore’s Law, would not have been possible without continuous improvement in the underlying basic technology, and extension of the understanding and application of magnetism on a microscopic level. A key achievement in this regard was the discovery of the effect of Giant Magnetoresistance (GMR), which is based on the orientation of magnetic moments in an assembly of different magnetic and non-magnetic slim layers of a thickness of only a few atoms. It is this effect which boosted the development and enabled the tremendous growth of hard disk capacity of the last decade. Further applications include new magnetic sensors. The outstanding relevance of this development is reflected by the joint awarding of the Nobel Prize of Physics in 2007 to the discoverers of this effect, Peter Gr¨unberg and Albert Fert. Magnetic data storage is now a key technology of the information age and will continue to be so for the foreseeable future. In order to fuel the development of ever miniaturized areas in magnetic storage and ever decreasing switching times of devices a deepened understanding of the magnetic properties of the materials in use, in particular its magnetic excitations and switching dynamics is indispensable. $\textbf{Theoretical and experimental investigations}$ While macroscopic properties have been understood quite early from a phenomenological point of view, its microscopic origin has been unclear for a long time. This has only been revealed after the development of [...]
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